Class 250 NRS Flanged Gate Valve

Model：GV-07
Date Updated: August 14, 2026
Prepared by: Gate Valve Technical Department

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Ningjin APC Industries is a premier UL & FM certified manufacturer in China, delivering high-performance industrial and fire protection valves built to strict international safety standards.

Class 125 Non-Rising Stem Gate Valve

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Class 250 NRS Flanged Gate Valve

▏Product Description

The Class 250 NRS Flanged Gate Valve (Model GV-07) manufactured by Ningjin APC Industries is a high-pressure fluid control solution engineered for demanding municipal water networks, industrial wastewater lines, and commercial HVAC piping systems. Designed in compliance with MSS SP-70 specifications and hydrostatically tested per API 598 guidelines, this valve features an internal non-rising stem (NRS) mechanism that maintains a constant vertical envelope, ideal for compact installations such as underground vaults and restricted mechanical rooms. Built with a high-strength Cast Iron or Ductile Iron body, corrosion-resistant Bronze seat rings, and a precision-machined Brass stem, the GV-07 delivers bi-directional zero-leakage shutoff under Class 250 working pressure across operating temperatures from -20°C to 180°C. B2B procurement managers, mechanical engineers, and EPC contractors can rely on Ningjin APC Industries as a premier Class 250 NRS Flanged Gate Valve manufacturer for custom flange drilling, protective coatings, and tailored OEM solutions.

▏Technical Features

Feature Item	Specification Details
Size	DN50-DN600 / 2"-24"
Working Pressure	Class 250
Design Standard	MSS SP-70
Test Standard	API 598
Flange Standard	ASME / ANSI B16.1 Class 125 or 16.42 Class 150 or BS EN 1092-2 PN16
Face to Face Standard	ASME B16.10 / BS EN558-1
Working Temperature	-20°C to 180°C
Note	NSF 61 and NSF 372 approval available for 2"-12"

▏Valve Material List

NO.	Description	Material
1	Body	Cast Iron / Ductile Iron
2	Seat Rings	Bronze
3	Disc Face Rings	Bronze
4	Disc	Cast Iron / Ductile Iron
5	Disc Nut	Brass
6	Stem	Brass
7	Body Gasket	Stainless Steel Spiral wound
8	Bolts	Steel
9	Nuts	Steel
10	Bonnet	Cast Iron / Ductile Iron
11	Gland Follower Bolts	Steel
12	Stuffing Box Gasket	Graphite
13	Stuffing Box	Cast Iron
14	Packing	Graphite
15	Gland Follower	Ductile Iron
16	Packing Gland	Brass
17	Handwheel	Cast Iron / Ductile Iron
18	Identification Plate	Aluminium
19	Washer	Steel
20	Handwheel Nut	Steel

▏Dimensions

DN	INCH	L	Dg	D	b	ANSI 300		Do	H
DN	INCH	L	Dg	D	b	Dk	n-d	Do	H
50	2"	216	106.5	165	22.3	127	8-19	178	289
65	2.5"	241	125.5	191	25.4	149	8-22	178	323
80	3"	282	144.5	210	28.6	168	8-22	200	338
100	4"	305	176.5	254	31.8	200	8-22	254	411
125	5"	381	211.5	279	35	235	8-22	300	503
150	6"	403	246.5	318	36.6	270	12-22	300	558
200	8"	419	303.5	381	41.3	330	12-25	348	650
250	10"	457	357.5	445	47.6	387	16-29	400	770
300	12"	502	418	521	50.8	451	16-32	457	861
350	14"	572	481.5	584	54	514	20-32	508	991
400	16"	610	535	648	57.3	572	20-35	558	1058
450	18"	660	592.5	711	60.4	629	24-35	610	1206
500	20"	711	649.5	775	63.5	686	24-35	640	1276
600	24"	787	768.5	914	69.9	813	24-41	762	1466

▏Frequently Asked Questions

What design standards and pressure ratings govern the Class 250 NRS Flanged Gate Valve (Model GV-07)?

The Class 250 NRS Flanged Gate Valve (Model GV-07) engineered by Ningjin APC Industries is designed to meet rigorous industrial fluid control requirements in accordance with MSS SP-70 standards and API 598 testing protocols. Operating under a robust Class 250 pressure rating, this non-rising stem flanged gate valve accommodates nominal pipe sizes ranging from DN50 (2") to DN600 (24"). End flange connections adhere to ASME/ANSI B16.1 Class 125, ASME 16.42 Class 150, or BS EN 1092-2 PN16 standards, while overall face-to-face dimensions follow ASME B16.10 or BS EN558-1 specifications. Built to withstand continuous working temperatures between -20°C and 180°C, the valve ensures reliable isolation for municipal water distribution, industrial wastewater treatment, and heavy-duty HVAC mechanical systems.

What materials are used in the construction of the Class 250 NRS Flanged Gate Valve?

The Class 250 NRS Flanged Gate Valve features heavy-duty body, bonnet, disc, stuffing box, and handwheel components manufactured from high-grade Cast Iron or Ductile Iron. For exceptional sealing and corrosion resistance, the seat rings and disc face rings are crafted from durable Bronze. The internal non-rising operating stem and disc nut are constructed from precision-machined Brass, complemented by a Brass packing gland. To ensure dependable static seal integrity between body and bonnet, the assembly incorporates a Stainless Steel spiral wound body gasket, along with graphite packing and a graphite stuffing box gasket. Heavy-duty steel bolts, nuts, and washers maintain structural rigidity under Class 250 pressure conditions.

How does the Non-Rising Stem (NRS) feature benefit compact and underground piping installations?

Featuring an internal non-rising stem (NRS) design, the Class 250 NRS Flanged Gate Valve operates smoothly without increasing overall vertical height during opening or closing cycles. This fixed-height profile makes it an essential choice for space-restricted environments such as underground valve vaults, compact mechanical rooms, and trench installations. Project engineers and procurement teams seeking heavy-duty fluid control solutions can source directly from a trusted Class 250 NRS Flanged Gate Valve supplier like Ningjin APC Industries, benefiting from custom flange drilling, specialized protective coatings, and full technical compliance support for large-scale infrastructure projects.

What testing and quality control procedures are applied to the Class 250 NRS Flanged Gate Valve?

To guarantee zero-leakage isolation and reliable field performance, every Class 250 NRS Flanged Gate Valve undergoes comprehensive 100% hydrostatic shell and seat pressure testing in strict alignment with API 598 inspection standards. Ningjin APC Industries maintains an ISO 9001 certified manufacturing plant, ensuring consistent metallurgy and precise tolerances across all valve components. For potable water applications spanning sizes 2" to 12" (DN50-DN300), NSF 61 and NSF 372 approval options are available upon request. These stringent quality assurance measures deliver long-term operational safety for municipal water mains, process cooling loops, and high-pressure fluid lines.

What manufacturing lead times and OEM customization services apply to B2B orders of the Class 250 NRS Flanged Gate Valve?

Ningjin APC Industries supplies the Class 250 NRS Flanged Gate Valve on a made-to-order basis with a standard production lead time of 45 working days for international B2B orders. Engineering procurement managers and industrial valve distributors can leverage extensive OEM and ODM customization options, including specialized epoxy coatings, custom flange connections, and tailored material configurations. Every production batch is delivered with complete mill test certificates, hydrostatic testing records, and detailed dimensional documentation to streamline project procurement, site inspection, and technical commissioning for global contractors.

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